// $Id: IterableEnumerable.java 12 2012-11-25 05:07:59Z marcel.kloubert $

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package net.metalvz.linq;

import java.util.Collection;
import java.util.Iterator;
import java.util.List;

/**
 * A sequence that uses an iterable.
 * 
 * @author Marcel Joachim Kloubert <marcel.kloubert@gmx.net>
 *
 * @param <T> Type of the items of the iterable.
 */
public final class IterableEnumerable<T> extends EnumerableBase<T> {
	private final Iterable<T> _SEQ;
	
	/**
	 * Initializes a new instance of that class.
	 * 
	 * @param seq The inner sequence.
	 */
	public IterableEnumerable(Iterable<T> seq) {
		this._SEQ = seq;
	}

	@Override
	public boolean contains(T itemToCheck) {
		if (this._SEQ instanceof Collection<?>) {
			return ((Collection<T>)this._SEQ).contains(itemToCheck);
		}
		
		return super.contains(itemToCheck);
	}

	@Override
	public int count() {
		if (this._SEQ instanceof Collection<?>) {
			return ((Collection<T>)this._SEQ).size();
		}
		
		return super.count();
	}
	
	@Override
	public int indexOf(T itemToSearch) {
		if (this._SEQ instanceof List<?>) {
			return ((List<T>)this._SEQ).indexOf(itemToSearch);
		}
		
		return super.indexOf(itemToSearch);
	}
	
	@Override
	public Iterator<T> iterator() {
		return this._SEQ.iterator();
	}
}
